In his review of Nina Munk's error-filled and out-of-date book, Bill Gates oddly abandons the rigorous approach to measurement and evaluation that defines his foundation's invaluable work. He simply accepts Munk's assertion that the Millennium Villages Project — an ongoing development project across more than 20 African countries — has failed. In fact, it is flourishing.

This credulousness is puzzling. Munk's book covers only a sliver of the first half of a ten-year project, and only two of 12 villages. And she never "lived for extended periods in the Millennium Villages." Munk spent an average of around six days per year — around 36 days over six years — actually visiting the villages, and usually at a stretch of 2-3 days. Moreover, she came to the story as a reporter for the magazine Vanity Fair, with no training or experience in public health, agronomy, economics, or African development.